diff --git a/fdbserver/workloads/DcLag.actor.cpp b/fdbserver/workloads/DcLag.actor.cpp
index 93044caee58..1b2a5df8151 100644
--- a/fdbserver/workloads/DcLag.actor.cpp
+++ b/fdbserver/workloads/DcLag.actor.cpp
@@ -158,7 +158,8 @@ struct DcLagWorkload : TestWorkload {
 		TraceEvent("DcLag").detail("StartTime", startTime).detail("EndTime", workloadEnd);
 
 		// Clog and wait for recovery to happen
-		if (!self->clogTlog(self->testDuration)) {
+		double clogDuration = self->testDuration * (0.5 + 0.4 * deterministicRandom()->random01());
+		if (!self->clogTlog(clogDuration)) {
 			return Void(); // skip the test if no satellite found
 		}
 
diff --git a/fdbserver/workloads/FailoverWithSSLag.actor.cpp b/fdbserver/workloads/FailoverWithSSLag.actor.cpp
index 12022cf5c75..5f34a20d9a1 100644
--- a/fdbserver/workloads/FailoverWithSSLag.actor.cpp
+++ b/fdbserver/workloads/FailoverWithSSLag.actor.cpp
@@ -259,7 +259,8 @@ struct FailoverWithSSLagWorkload : TestWorkload {
 		}
 
 		// Clog connections between remote tlogs and storage servers.
-		if (!self->findAndClogRemoteStorages(self->testDuration)) {
+		double clogDuration = self->testDuration * (0.5 + 0.4 * deterministicRandom()->random01());
+		if (!self->findAndClogRemoteStorages(clogDuration)) {
 			// Couldn't find remote tlogs/storage servers. Probably configuration will
 			// need to be adjusted.
 			self->testSuccess = false;